CN116400369A - Detection method and device based on quantum induced coherence - Google Patents
Detection method and device based on quantum induced coherence Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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Abstract
The invention provides a detection method and a detection device based on quantum induced coherence, wherein the detection method does not directly measure signals from an object to be detected, but transmits information of the object to be detected carried on first detection light to first reference light which is always stored locally through quantum coherence. The simultaneous acquisition of the distance information and the image information of the object to be detected is realized through the interference between the first reference light and the second reference light. The non-contact detection mode can effectively solve the problems of low signal to noise ratio caused by background noise and incapability of working under saturated interference attack in the traditional optical remote sensing and quantum illumination-based radar. Furthermore, the detection method provided by the invention can realize the simultaneous detection of the distance information and the image information of the object to be detected without carrying out joint measurement on the two entangled subsystems, and the response wavelength of the detector is different from the wavelength of the light interacted with the object to be detected, thereby greatly reducing the requirement on the detector.
Description
Technical Field
The invention relates to the technical field of quantum measurement, in particular to a detection method and device based on quantum induced coherence.
Background
Optical radar has been widely used in various fields since the sixty of the twentieth century as an optical remote sensing technology. The principle of the method is the same as that of the traditional microwave or radio radar detection, a detection signal is emitted to a detected target, and the reflected signal and the emission signal are compared and processed to obtain a series of parameters of the detected target. Different reflectivity for different targets, enabling target recognition capability. Optical radars with different operating wavelengths can be used for different detection targets to achieve targeted detection. The optical radar generally uses laser as a detection signal, and the pulse can be very short due to the good directivity of the laser, so that the optical radar has very high precision in imaging and ranging. The optical radar can obtain faster and clearer imaging and more accurate ranging precision, which enables the optical radar to be strongly supported in various directions such as industrial fields, military fields and the like. Currently, there are millimeter-scale optical radar detectors in experiments, and laser radar plays a vital role in unmanned autopilot. However, due to strong environmental scattering and noise, optical radars still have significant drawbacks in terms of weak signal extraction, for example, lidars will be difficult to use in extreme weather conditions such as sand storms. In addition, other light sources in the environment, such as sunlight, are prone to signal interference.
Quantum entanglement is often used to improve detection signal-to-noise ratio over weak signal detection due to its unique delocalized nature. In the field of optical remote sensing and ranging (LiDAR), quantum illumination-based ranging techniques smartly utilize joint measurement techniques to effectively distinguish weak signals from noise. In such quantum remote sensing technology, one beam of detection light is generally emitted to detect an object to be detected, and the other beam of reference light entangled with the detection light remains locally. Since quantum correlation provides an extra dimension we have a way to distinguish the detected photons from the noisy background that is reflected back. By designing the two-photon coincidence counting detection of the reflected detection light and the local reference light, more information from the object to be detected can be obtained than in the classical detection means. However, existing quantum radar technology based on joint measurement (joint measurement) requires detectors with high quantum efficiency, high time resolution, and high saturation counts. Due to the state of the art of photodetectors, the ranging accuracy of such quantum radars can only reach the millimeter level, and the quantum advantages of such quantum radars compared with classical radars can also be displayed only under extremely low light conditions. Furthermore, it still needs to detect reflected light from the object under test, which results in its inability to operate in extremely noisy environments and when subject to blinding attacks.
Disclosure of Invention
The invention provides a detection method and a detection device based on quantum-induced coherence in order to overcome the defects of the prior art.
In order to achieve the above object, the present invention provides a detection method based on quantum-induced coherence, comprising:
the method comprises the steps that a first spontaneous parametric down-conversion occurs on a pumping light pumping entangled light source to obtain first mixed light, wherein the first mixed light comprises pumping light, first reference light and first detection light which are entangled with each other;
separating first detection light and first reference light from the first mixed light, irradiating the first detection light to an object to be detected, and irradiating the first reference light to a reference light reflecting mirror positioned on a local displacement table;
the first detection light is reflected by the part of the object to be detected, carries the information of the object to be detected and returns to the entanglement light source in an original way, the first reference light is reflected to the entanglement light source in an original way by the reference light reflector, the pumping light is reflected to the entanglement light source in an original way by the pumping light reflector so as to generate second spontaneous parameter down-conversion to obtain second mixed light, and the second mixed light comprises second reference light and second detection light which are entangled with each other, first detection light and first detection light which are entangled with each other and pumping light; the first reference light and the second reference light are overlapped in space mode, and the first detection light and the second detection light are overlapped in space mode;
separating the first reference light and the second reference light from the second mixed light;
irradiating the separated first reference light and second reference light onto a reference light detector;
adjusting a local displacement table to scan the optical path of the first reference light, and acquiring local displacement table parameters when the visibility of interference fringes of two beams of reference light on a reference light detector is maximum so as to obtain distance information of an object to be detected; and obtaining image information of the object to be measured according to the visibility of interference fringes at different positions on the reference photodetector.
According to the embodiment of the invention, when the object to be detected has only one reflecting surface for the first detection light, the distance information of the object to be detected from the entanglement light source is obtained according to the local displacement table parameter when the visibility of the interference fringes is maximum;
when the object to be detected has a plurality of reflecting surfaces for the first detection light, the movement of the local displacement table can enable the visibility of the interference fringes to be maximum for a plurality of times on the reference light detector; and obtaining thickness information of the object to be measured according to the local displacement table parameters when the visibility of the multiple interference fringes is maximum.
According to an embodiment of the present invention, the wavelengths of the two reference lights are equal and the wavelengths of the two probe lights are also equal, the wavelengths of the probe lights are not equal to the wavelengths of the reference lights, and the wavelengths of the probe lights and the reference lights are continuously adjustable.
On the other hand, the invention also provides a detection device based on quantum induced coherence, which comprises a pumping light source, an entanglement light source, a transmitting and receiving optical component and a measuring optical component.
The pump light source pumps the entangled light source to generate first spontaneous parametric down-conversion to obtain first mixed light, wherein the first mixed light comprises pump light, first reference light and first detection light which are entangled with each other.
The transmitting and receiving optical assembly separates first reference light, first detection light and pumping light from the first mixed light, the first detection light irradiates the object to be detected and is reflected by the part of the object to be detected, carries information of the object to be detected and returns to the entanglement light source in an original way; the first reference light is reflected to the entanglement light source by a reference light reflector located on the local displacement table in an original way; the pump light is reflected back to the entangled light source by the pump light reflector to generate a second spontaneous parametric down-conversion to generate a second mixed light; the second mixed light comprises second reference light and second detection light which are entangled with each other, first detection light and first detection light which are entangled with each other, and pump light; the first reference light and the second reference light are overlapped in space mode, and the first detection light and the second detection light are overlapped in space mode.
The measuring optical component separates the first reference light and the second reference light from the second mixed light and irradiates the first reference light and the second reference light onto the reference light detector; and adjusting the local displacement table to scan the optical path of the first reference light, acquiring the local displacement table parameters when the visibility of interference fringes of two beams of reference light on the reference light detector is maximum to obtain the distance information of the object to be measured, and acquiring the image information of the object to be measured according to the visibility of the interference fringes of different positions on the reference light detector.
According to an embodiment of the present invention, a transmitting-receiving optical assembly includes: a parabolic mirror, a first dichroic mirror, a pump light mirror, a second dichroic mirror, a displacement stage, and a reference light mirror located on the displacement stage.
The parabolic mirror collimates the first mixed light generated by the entanglement light source and reflects the first mixed light to the first dichroic mirror;
the first dichroic mirror reflects the pump light in the first mixed light to the pump light reflecting mirror;
the first reference light and the first detection light are transmitted through the first dichroic mirror to the second dichroic mirror;
the second dichroic mirror reflects the first detection light to an object to be detected of the object to be detected;
a first reference light is transmitted through a first dichroic mirror to a reference light mirror on the local displacement stage;
the first detection light is reflected by the original path of the object to be detected, the first reference light is reflected by the original path of the reference light reflector, the pump light is reflected by the original path of the pump light reflector, and the three are collected by the parabolic mirror and then reflected to the entanglement light source.
According to an embodiment of the present invention, the pump light reflecting mirror, the object to be measured and the reference light reflecting mirror are all located substantially on the fourier plane of the parabolic mirror.
According to an embodiment of the present invention, in an embodiment of the present invention, the measurement optical assembly includes a third dichroic mirror, a lens filter, and a reference photodetector;
the third dichroic mirror reflects the first reference light and the second reference light from the second mixed light emitted from the entangled light source;
the lens collects the first reference light and the second reference light reflected by the third dichroic mirror;
the optical filter is arranged in front of the reference light detector and filters other interference light so that the first reference light and the second reference light enter the reference light detector;
the reference light detector is used for measuring interference between the first reference light and the second reference light.
According to an embodiment of the invention, the photosurface of the reference photodetector is located substantially on the fourier plane of the lens.
According to an embodiment of the present invention, the pump light source is a light source with an optical isolator, and the detection device based on quantum induced coherence further includes a wave plate disposed between the pump light source and the third dichroic mirror for adjusting polarization.
In summary, in the detection method and the device based on quantum induced coherence provided by the invention, two beams of reference light which interfere to generate detection information do not directly contact an object to be detected, so that the detection method and the device are a non-contact detection mode, and the defects of low signal to noise ratio and easiness in saturation attack caused by background noise in the traditional optical remote sensing and quantum illumination radar can be effectively avoided. Furthermore, the detection method provided by the invention can realize the simultaneous detection of the distance information and the image information of the object to be detected without carrying out joint measurement on two entangled subsystems, thereby greatly reducing the requirements on the detector. Moreover, the probe light interacting with the object to be measured is of a different wavelength than the reference light to be finally measured, which means that our inventive optical radar can operate in a band where the detector is not able to correspond.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
Fig. 1 is a schematic flow chart of a detection method based on quantum induced coherence according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a detection device based on quantum induced coherence according to an embodiment of the present invention.
Detailed Description
Quantum entanglement proceeds through the spontaneous parametric down-conversion process of nonlinear crystals to produce a series of entangled photon pairs. Since conservation of energy is to be satisfied within the crystal, the wavelengths of the entangled photons generated have a relationship:
wherein the short-wave portion lambda s Is signal light, long wave part lambda i Is idle light (idler). In quantum ranging, one beam of light is used as probe light and the other beam of light is used as reference light. In the example, the long-wave idle light is emitted to detect the existence and distance measurement of an object to be detected; while the short wave signal light remains locally as reference light. The existing quantum illumination ranging technology is based on joint measurement (joint measurement) of reference light and probe light, and radar signal extraction superior to a classical mode is achieved by utilizing the correlation characteristic between the reference light and the probe light. Limited by the detection strategy of photon counting, quantum advantages are only manifested at weak signal levels. Limited by the detector performance, the existing range resolution stays only on the order of millimeters. And because reflected light from an object to be detected still needs to be detected, the device cannot work normally in a large noise environment and under the condition of being attacked by saturated interference.
In view of this, the present invention provides a detection method based on quantum induced coherence, which includes: the pump light pumps the entangled light source to generate a first spontaneous parametric down-conversion to obtain a first mixed light, which includes the pump light and the entangled first reference light and the first probe light (step S10). The first probe light and the first reference light are separated from the first mixed light, the first probe light is irradiated to the object to be measured and the first reference light is irradiated to the reference light reflecting mirror located on the local displacement stage (step S20). The first detection light is reflected by the object to be detected, carries the information of the object to be detected and returns to the entanglement light source in the original path, the first reference light is reflected to the entanglement light source in the original path by the reference light reflector, and the pump light is reflected back to the entanglement light source in the original path by the pump light reflector so as to generate a second mixed light after the second spontaneous parameter down-conversion (step S30). The second mixed light comprises second reference light and second detection light which are entangled with each other, first detection light and first detection light which are entangled with each other, and pump light; the first reference light and the second reference light are overlapped in space mode, and the first detection light and the second detection light are overlapped in mode. The first reference light and the second reference light are separated from the second mixed light (step S40). The separated first and second reference lights are irradiated onto the reference light detector (step S50). Adjusting a local displacement table to scan the optical path of the first reference light, and acquiring local displacement table parameters when the visibility of interference fringes of two beams of reference light on a reference light detector is maximum so as to obtain distance information of an object to be detected; and obtains image information of the object to be measured according to the visibility of interference fringes at different positions on the reference photodetector (step S60).
Based on the principle of quantum-induced coherence, the reference light (first reference light and second reference light) obtained by two times of spontaneous parametric down-conversion is the same type of light that is physically indistinguishable (i.e., so-called path information is indistinguishable). For convenience of description in the present invention, two paths of reference light having different path information are named in a manner of a first reference light and a second reference light. Similarly, the detected light (the first detected light and the second detected light) obtained by the two spontaneous parametric down-conversion and having the two path information is also the same type of light which cannot be distinguished physically, and the two detected light beams are respectively named as the first detected light and the second detected light for convenience of description in the present invention.
According to the detection method based on quantum induced coherence, first detection light obtained by primary spontaneous parametric down-conversion of the entanglement light source is directed to an object to be detected, partial reflection light of the first detection light and first reference light mixed with the first reference light which is remained locally and entangled with the first detection light are returned to the entanglement light source again, and quantum induced coherence is generated between the first detection light and second reference light generated by pumping of the pump light which is reflected back to the entanglement light source by the primary. According to the momentum inverse correlation characteristic between the first detection light and the first reference light, the path information of the object to be detected carried on the first detection light is also shared in the local first reference light; i.e. a copy of the detection signal from the first detection light, which is susceptible to interference, to the first reference light, which is located locally and clean, is achieved. On the basis, the first detection light and the second detection light completely coincide in the space mode in the entanglement light source, and the first reference light and the second reference light completely coincide in the space mode in the entanglement light source. This arrangement makes the path information of the two beams of detection light (refer to the first detection light and the second detection light) indistinguishable from each other, and the path information of the two beams of reference light (refer to the first reference light and the second reference light) indistinguishable from each other; thereby generating interference, and the visibility of the interference fringes is proportional to the reflectivity of the object to be detected to the first detection light amplitude. When the visibility of interference fringes of the two beams of reference light on the reference light detector is maximum, the distance from the reference light reflecting mirror on the local displacement table to the entanglement light source is equal to the distance from the object to be measured to the entanglement light source. Therefore, the visibility of interference fringes can be adjusted by moving the local displacement table to scan the optical path of the first reference light, and further the distance measurement of the object to be measured is realized.
According to the detection method based on quantum induced coherence, the first detection light directly contacted with the object to be detected is not directly adopted to form an interference signal, but information of the object to be detected carried on the first detection light is copied to the first reference light stored locally and not contacted with the object to be detected based on quantum entanglement characteristics to form non-contact ranging, so that the problems of low signal-to-noise ratio caused by background noise and easiness in being affected by saturated interference attack are effectively avoided. The interference of the two beams of reference light and the scanning of the local displacement table on the optical path of the first reference light enable the detection method based on quantum induced coherence provided by the embodiment to detect the distance of the object to be detected without jointly measuring the two entanglement subsystems. The wavelength of the detection light interacted with the object to be detected and the wavelength of the reference light interfering on the reference light detector are different and adjustable; the arrangement greatly reduces the measurement difficulty and the requirements on the performance of the reference light detector, and the reference light detector has wider selection range and better control on the cost. Furthermore, based on the momentum inverse relation between the reference light and the detection light, the detection method based on quantum induced coherence provided by the embodiment can simultaneously realize synchronous detection of distance information of the object to be detected and image information on the outline.
Furthermore, unlike single-point detectors used in previous radars, the reference photodetector in this example is an area-array camera that receives an image with a two-dimensional structure and with different positions on the image corresponding to entangled photon pairs of different wavelength combinations. When the saturated blind attack of the laser with high spectral power density is carried out, only strict phase matching is achieved, the attack beam and the pumping light can trigger excited parameter down-conversion to generate a bright spot on the reference light detector, and other areas are not obviously affected. The probability of saturation attack of the excited parameter down-conversion of strict phase matching is very low, and even if the interference condition occurs, the detection method based on quantum induced coherence provided by the embodiment can effectively erase the saturation attack by changing the geometric parameters of the crystal position, such as the rotation angle or the temperature.
The distance information of the object to be measured comprises the distance between the object to be measured and the entanglement light source and the thickness of the object to be measured. Specifically, when the object to be measured has only one reflecting surface for the first detection light, the visibility of the interference fringes can be detected only once on the reference light detector when the local displacement table is moved to scan the optical path of the first reference light, and the distance information of the object to be measured from the entanglement light source can be obtained based on the local displacement table parameter at the moment. When the object to be measured has a plurality of reflecting surfaces for the first detection light, since the detection light penetrates the object to be measured, reflection occurs on each reflecting surface. Therefore, the movement of the local displacement table can enable the maximum visibility moment of the interference fringes to appear on the reference light detector, and the thickness information of the object to be measured can be obtained based on the local displacement table parameters when the visibility of the interference fringes is maximum each time.
In this embodiment, the wavelengths of the two reference lights (the first reference light and the second reference light) are equal, and the wavelengths of the two detection lights (the first detection light and the second detection light) are also equal, and the wavelength of the detection light is longer than the wavelength of the reference light and the wavelengths of the detection light and the reference light are continuously adjustable. Specifically, the spectrum of the two reference light beams generated by the entangled light source may be covered by visible light to the infrared band. The broad spectral range allows the reference light to have a shorter coherence length, and interference occurs only when the optical path taken by the first reference light from the entangled light source to return to the entangled light source is equal to the optical path taken by the first probe light from the entangled light source to return to the entangled light source. However, the reference light and the probe light first probe light are allowed to be different in any dimension based on the quantum entanglement characteristics, which is not limited in any way by the present invention.
Based on the pumping of the pump light, the first spontaneous parametric down-conversion of the entangled light source in step S10 obtains a first mixed light including the pump light, the first reference light, and the first probe light. The first probe light and the first reference light need to be separated before step S20 is performed. Specifically, this can be achieved by providing two dichroic mirrors. Similarly, in step S40, two beams of reference light (the first reference light and the second reference light) may be separated from the second mixed light by providing a dichroic mirror.
In correspondence with the above-described detection method based on quantum induced coherence, as shown in fig. 2, the present example provides a detection device based on quantum induced coherence, which includes a pump light source 1, an entanglement light source 3, a transmitting-receiving optical component 4, and a measuring optical component 5. Specifically, based on the pumping of the pumping light source 1, the entangled light source 3 undergoes a first spontaneous parametric down-conversion to generate first probe light and first reference light entangled with each other. In this embodiment, the pump light outputted from the pump light source 1 is a green laser light having a line width of 10kHZ and a center frequency of 532 nm. The nonlinear crystal used for entanglement light source 3 is a type-0 periodically polarized lithium niobate crystal (PPLN) of 20mm in length, 1mm in width and 1mm in height. However, the present invention is not limited in any way thereto. In other embodiments, the center frequency and line width of the pump light can be adjusted according to the detection requirement; likewise, the entangled light source 3 may be a nonlinear crystal made of other materials, and its size may be adjusted as needed.
In this embodiment, the pump light source 1 is a light source with an optical isolator, and further includes a wave plate 6 for adjusting the polarization of the pump light. When the laser beam is applied, laser emitted by the pump light source 1 is collimated on an optical platform and passes through an optical isolator, and the optical isolator can prevent reflected light from damaging the pump light source 1. The pump light is collimated and then is input into the entanglement light source 3 after polarization adjustment by the wave plate 6. In this embodiment, the pump light collimated into the entanglement light source 3 has a diameter of 0.42mm. In the present embodiment, the entanglement light source 3 is installed in a constant temperature table for the purpose of controlling the temperature of the entanglement light source 3 so that the entanglement light source 3 satisfies different phase matching conditions. Preferably, the temperature of the entanglement light source 3 is set at 146.4 degrees celsius to obtain reference light of 893nm and probe light of 1316 nm. However, the present invention is not limited in any way thereto.
The transmitting-receiving optical assembly 4 separates the first probe light irradiated to the object to be measured 10, the first reference light irradiated to the reference light mirror 45 on the local displacement stage, and the pump light irradiated to the pump light mirror 43 from the first mixed light generated by the entanglement light source 3. Based on the reflection of the object to be measured 10, the reference light mirror 45 and the pump light mirror 43, part of the first probe light, the first reference light and the pump light are returned to the entanglement light source 3. The pump light returned by the primary path secondarily pumps the entangled light source to generate a second mixed light including the pump light, the first probe light, the first reference light, the second probe light, and the second reference light.
Specifically, as shown in fig. 2, the transmitting-receiving optical assembly 4 includes a parabolic mirror 41, a first dichroic mirror 42, a pump light mirror 43, a second dichroic mirror 44, and a reference light mirror 45 located on a displacement stage. The parabolic mirror 41 serves to collimate the first reference light and the first detection light generated from the entanglement light source 3, and reflect the first mixed light to the first dichroic mirror 42. In addition, the parabolic mirror 41 is further configured to collect a portion of the first reference light, the first probe light, and the pump light reflected by the primary path. The first dichroic mirror 42 reflects the pump light from the first mixed light to the pump light mirror 43. The first reference light and the first detection light are transmitted through the first dichroic mirror 42 to be emitted to the second dichroic mirror 44. The second dichroic mirror 44 reflects the first detection light to the object 10 to be measured, which is located substantially on the fourier plane of the parabolic mirror 41. The first reference light passes through the second dichroic mirror 44 to impinge on a reference light mirror 45 located on the local displacement stage. Part of the first detection light is reflected to the entanglement light source 3 by the original path of the object 10 to be detected; the first reference light is reflected by the reference light mirror 45 in the primary way to the entanglement light source 3; the pump light is reflected by the pump light mirror 43 in the primary direction to the entangled light source 3, and the entangled light source 3 is pumped a second time to generate a second reference light and a second probe light. The pump light, the first reference light, the first probe light, the second reference light, and the second probe light constitute a second mixed light. However, the specific structure of the transmitting-receiving optical assembly and the placement position of each component are not limited in the present invention; other structures of the transmitting-receiving optical assembly capable of separating the first detection light and the first reference light from the first mixed light so as to make the first detection light and the first reference light respectively irradiate to the object to be detected and the reference light reflecting mirror are within the protection scope of the invention.
In this embodiment, the measurement optical assembly 5 includes a third dichroic mirror 51, a lens 52, a filter 53, and a reference light detector 54. The third dichroic mirror 51 reflects the first reference light and the second reference light from the second mixed light. The lens 52 serves to collect the reflected first and second reference light. The filter 53 is placed before the reference photodetector 54 to filter out other wavelengths of light that are not desired to be detected, ensuring that only two beams of reference light enter the reference photodetector 54. The reference light detector 54 is used to measure interference between the first reference light and the second reference light.
In the present embodiment, the pump light reflecting mirror 43, the object to be measured 10 and the reference light reflecting mirror 45 are all located on the fourier plane of the parabolic mirror 41; the photosurface of the reference photodetector 54 also lies substantially in the fourier plane of the lens 52. This arrangement allows for optimal lateral resolution of the interference fringes obtained at the reference photodetector 54. However, the present invention is not limited in any way thereto.
Based on the scanning of the first reference light path by the local displacement table provided with the reference light reflecting mirror 45, acquiring parameters of the displacement table when the visibility of the interference fringes of the two beams of reference light on the reference light detector 54 is maximum so as to obtain distance information of the object 10 to be detected; and obtains image information of the object 10 to be measured based on the interference fringe intensities at different positions on the reference photodetector 54. Specifically, after obtaining the parameter of the displacement table when the visibility of the interference fringes is maximum, the distance from the local displacement table to the entanglement light source 3 can be measured by actual measurement or other optical path measurement modes, so as to obtain the distance from the object 10 to be measured to the entanglement light source 3. For the surface profile detection of the object to be detected, due to the inverse correlation characteristic of the reference light and the detection light quantity, the maximum value of the visibility of the interference fringes at different positions on the reference light detector is recorded, wherein the maximum value of the visibility of the interference fringes at different positions corresponds to the reflectivity of the different positions of the object to be detected to the first detection light, namely the image of the object to be detected.
In summary, in the detection method and the device based on quantum induced coherence provided by the invention, two beams of reference light which interfere to generate detection information do not directly contact an object to be detected, so that the detection method and the device are a non-contact detection mode, and the defects of low signal to noise ratio and easiness in saturation attack caused by background noise in the traditional optical remote sensing and quantum illumination radar can be effectively avoided. Furthermore, the detection method provided by the invention can realize the simultaneous detection of the distance information and the image information of the object to be detected without carrying out joint measurement on two entangled subsystems, thereby greatly reducing the requirements on the detector. Moreover, the probe light interacting with the object to be measured is of a different wavelength than the reference light to be finally measured, which means that our inventive optical radar can operate in a band where the detector is not able to correspond.
Although the invention has been described with reference to the preferred embodiments, it should be understood that the invention is not limited thereto, but rather may be modified and varied by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A detection method based on quantum-induced coherence, comprising:
the method comprises the steps that a first spontaneous parametric down-conversion occurs on a pumping light pumping entangled light source to obtain first mixed light, wherein the first mixed light comprises pumping light, first reference light and first detection light which are entangled with each other;
separating first detection light and first reference light from the first mixed light, irradiating the first detection light to an object to be detected, and irradiating the first reference light to a reference light reflecting mirror positioned on a local displacement table;
the first detection light is reflected by the part of the object to be detected, carries the information of the object to be detected and returns to the entanglement light source in an original way, the first reference light is reflected to the entanglement light source in an original way by the reference light reflector, the pump light is reflected to the entanglement light source in an original way by the pump light reflector so as to generate second spontaneous parameter down-conversion to obtain second mixed light, and the second mixed light comprises second reference light and second detection light which are entangled with each other, first detection light and first detection light which are entangled with each other and the pump light; the first reference light and the second reference light are overlapped in space mode, and the first detection light and the second detection light are overlapped in space mode;
separating the first reference light and the second reference light from the second mixed light;
irradiating the separated first reference light and second reference light onto a reference light detector;
adjusting a local displacement table to scan the optical path of the first reference light, and acquiring local displacement table parameters when the visibility of interference fringes of two beams of reference light on a reference light detector is maximum so as to obtain distance information of an object to be detected; and obtaining image information of the object to be measured according to the visibility of interference fringes at different positions on the reference photodetector.
2. The method of claim 1, wherein the method comprises the steps of,
when the object to be detected has only one reflecting surface for the first detection light, obtaining the distance information of the object to be detected from the entanglement light source according to the local displacement table parameter when the visibility of the interference fringes is maximum;
when the object to be detected has a plurality of reflecting surfaces for the first detection light, the movement of the local displacement table can enable the visibility of the interference fringes to be maximum for a plurality of times on the reference light detector; and obtaining thickness information of the object to be measured according to the local displacement table parameters when the visibility of the multiple interference fringes is maximum.
3. The method for quantum-induced-coherence-based detection of claim 1, wherein:
the wavelengths of the two reference lights are equal, the wavelengths of the two detection lights are also equal, the wavelengths of the detection lights are unequal to the wavelengths of the reference lights, and the wavelengths of the detection lights and the reference lights are continuously adjustable.
4. A detection device based on quantum induced coherence is characterized in that: the device comprises a pumping light source, an entanglement light source, a transmitting-receiving optical component and a measuring optical component;
the device comprises a pumping light source, a pumping entangled light source and a first optical fiber, wherein the pumping light source pumps the entangled light source to generate first spontaneous parametric down-conversion to obtain first mixed light, and the first mixed light comprises pumping light, first reference light and first detection light which are entangled with each other;
the transmitting and receiving optical assembly is used for separating first reference light, first detection light and pumping light from the first mixed light, wherein the first detection light irradiates towards an object to be detected and is reflected by the part of the object to be detected, carries information of the object to be detected and returns to the entanglement light source in an original way; the first reference light is reflected to the entanglement light source by a reference light reflector located on the local displacement table in an original way; the pump light is reflected back to the entangled light source by the pump light reflector to generate a second spontaneous parametric down-conversion to generate a second mixed light; the second mixed light comprises second reference light and second detection light which are entangled with each other, first detection light and first detection light which are entangled with each other and pump light; the first reference light and the second reference light are overlapped in space mode, and the first detection light and the second detection light are overlapped in space mode;
a measurement optical component for separating the first reference light and the second reference light from the second mixed light and irradiating the first reference light and the second reference light onto a reference light detector; and adjusting the local displacement table to scan the optical path of the first reference light, acquiring the local displacement table parameters when the visibility of interference fringes of two beams of reference light on the reference light detector is maximum to obtain the distance information of the object to be measured, and acquiring the image information of the object to be measured according to the visibility of the interference fringes of different positions on the reference light detector.
5. The quantum-induced-coherence-based detection device of claim 4, wherein: the transmitting-receiving optical assembly includes: a parabolic mirror, a first dichroic mirror, a pump light reflecting mirror, a second dichroic mirror, a displacement stage, and a reference light reflecting mirror located on the displacement stage;
the parabolic mirror collimates the first mixed light generated by the entanglement light source and reflects the first mixed light to the first dichroic mirror;
the first dichroic mirror reflects the pump light in the first mixed light to the pump light reflecting mirror;
the first reference light and the first detection light are transmitted through the first dichroic mirror to the second dichroic mirror;
the second dichroic mirror reflects the first detection light to an object to be detected of the object to be detected;
a first reference light is transmitted through a first dichroic mirror to a reference light mirror on the local displacement stage;
the first detection light is reflected by the original path of the object to be detected, the first reference light is reflected by the original path of the reference light reflector, the pump light is reflected by the original path of the pump light reflector, and the three are collected by the parabolic mirror and then reflected to the entanglement light source.
6. The quantum-induced-coherence-based detection device of claim 5, wherein: the pumping light reflector, the object to be measured and the reference light reflector are all approximately positioned on the Fourier plane of the parabolic mirror.
7. The quantum-induced-coherence-based detection device of claim 4, wherein the measurement optical assembly comprises a third dichroic mirror, a lens, an optical filter, and a reference photodetector;
the third dichroic mirror reflects the first reference light and the second reference light from the second mixed light emitted from the entangled light source;
the lens collects the first reference light and the second reference light reflected by the third dichroic mirror;
the optical filter is arranged in front of the reference light detector and filters other interference light so that the first reference light and the second reference light enter the reference light detector;
the reference light detector is used for measuring interference between the first reference light and the second reference light.
8. The quantum-induced-coherence-based detection device of claim 7, wherein the photosurface of the reference photodetector is substantially in a fourier plane of the lens.
9. The quantum-induced-coherence-based detection device of claim 7, wherein the pump light source is a light source with an optical isolator, and further comprising a wave plate disposed between the pump light source and the third dichroic mirror for adjusting polarization.
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